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| Home > Publications database > Enabling Mg‐Based Ionic Liquid Electrolytes for Hybrid Dual‐Ion Capacitors |
| Journal Article | FZJ-2021-02133 |
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2021
Wiley-VCH
Weinheim
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Please use a persistent id in citations: http://hdl.handle.net/2128/27784 doi:10.1002/batt.202000246
Abstract: We report on the reversible (de)intercalation of TFSI− anions from a Mg‐based ionic liquid electrolyte, Mg(TFSI)2 in Pyr14TFSI, in graphite urn:x-wiley:25666223:media:batt202000246:batt202000246-math-0001 activated carbon hybrid dual‐ion capacitor (DIC) cells. The role of different pseudo reference electrodes (PREs) including Ag‐wire and Li metal is discussed regarding the comparability of different battery cells. We show that an Ag‐wire PRE is not suitable for the designated purpose, while the use of a Li metal PRE results in high reproducibility. Mg‐based DIC cells are compared with cells based on pure Pyr14TFSI and LiTFSI‐Pyr14TFSI electrolytes, and with graphite urn:x-wiley:25666223:media:batt202000246:batt202000246-math-0002 Li metal dual‐ion cells employing LiTFSI‐Pyr14TFSI. At 5.2 V vs. Li|Li+, Mg‐containing DIC cells reveal an improved performance compared to Li‐based cells, i. e., higher capacity (87 vs. 85 mAh g−1) and higher Coulombic efficiency (98 vs. 96 %). These results may pave the way to further studies and performance improvements of Mg‐based batteries and to hybrid DIC chemistries with other cations, especially multi‐valent ones.
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